RE: pizazz!? (sp?)
The Saito .72 with a APC 13x4W is the way to go. Your .46 will fly it Ok. It should even hover it with the right prop.(APC12.25x3.75 or12x4) However the difference in instant thrust and verticle will be night and day. If you go with the Saito be sure to get it as close to the firewall as possible. On my Pizzaz I had to notch the tank hatch to clear the intake tube.
My first 4C was the Saito .72 on the Pizzaz. I have since bought another .72 and a .82. For 3-d flying they are hard to beat. I had no trouble with break in or tuning. I have also never had a deadstick on any of the three.
David